Hoechst Stain is a fluorescent dye commonly used in biological research to stain nuclei of cells. It binds specifically to DNA, allowing scientists to visualize and analyze cell structures under a fluorescence microscope. This technique is particularly useful in studies involving cell division, apoptosis, and other cellular processes. The stain is often used in conjunction with other dyes to provide a comprehensive view of cellular components. Hoechst Stain can be applied to various types of samples, including tissue sections and cultured cells, making it a versatile tool in cell biology and histology research.